Thomas Siebel

Thomas Siebel
Siebel in 2013
Born
Thomas M. Siebel

(1952-11-20) November 20, 1952
Chicago, Illinois, U.S.
EducationUniversity of Illinois Urbana-Champaign (BA, MBA, MS)
OccupationsSoftware developer and businessman
Known forFounder of Siebel Systems and C3 AI
SpouseStacey Siebel
Children4
RelativesJennifer Siebel Newsom (second cousin once removed)
WebsiteThomas M. Siebel

Thomas M. Siebel (/ˈsiːbəl/; born November 20, 1952) is an American businessman, technologist, and author. He founded the enterprise software company Siebel Systems and was the founder, chairman, and former CEO of C3.ai, an artificial intelligence software platform and applications company. He is currently the chairman of First Virtual Group, a diversified holding company.

As of February 2026, Forbes puts Siebel's net worth at $4 billion.

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